Running A Multi-Point Ph/Ion Calibration; Automatic Buffer Recognition; Dissolved Oxygen (Do) Calibration - Mettler Toledo SevenGo Duo pro SG68 Instrucciones De Manejo

4.8.2 Running a multi-point pH/ion calibration

pH and ion calibrations can be run with this meter for up to 5 points.
1 Run the calibration as described in "Running a one-point pH/ion or one-point conductivity calibration"
(steps 1 - 3).
2 Rinse the electrode with deionized water.
3 Place the electrode in the next calibration buffer.
4 Press CAL.
Cal 2 appears on the display. The meter endpoints according to the preselected endpoint mode after
the signal has stabilized or after pressing READ. The relevant buffer value is shown on the display.
5 Repeat the steps b - d for all calibration buffers.
6 Press End to end the calibration procedure.
Alternatively, the meter ends the calibration automatically when 5 calibrations are performed. The offset
value and slope are shown on the display.
7 Press Save to keep the calibration.
8 Press EXIT to reject the calibration.
Note
Up to 5 calibrations can be saved for a dedicated sensor ID. The oldest calibration data is automatically
overwritten with the current calibration data.

4.8.3 Automatic buffer recognition

The meter features automatic pH buffer recognition for the predefined buffer groups (see "Appendix"). The
buffers within a buffer group are automatically recognized by the meter and displayed during calibration.
This feature allows the calibration in any order within a predefined pH buffer group.
There is no automatic pH buffer recognition for customized buffer groups; in this case, the defined order of the
buffers needs to be followed.

4.8.4 Dissolved oxygen (DO) calibration

Preparing for calibration
Before running a calibration:
The sensor has to be connected to the meter for at least 6 hours (polarization time).
For the following digital ISM DO sensors (InPro6850i, InPro6950i), the meters need to be switched on in
order for the sensor to be polarized.
The "Auto override" function should be switched on.
The membrane must be examined for damage or contamination. If the membrane is dirty, clean carefully
with a soft, moist cloth.
Performing a one-point calibration
The first point of a DO calibration is always done in vapor saturated air (100% O
1 Make sure that the sensor has been gently cleaned and dried. Water droplets on the membrane must be
removed, because they prevent the sensor from being correctly calibrated.
2 Press and hold MODE for 3 seconds to switch to single channel measurement screen when in dual
channel measurement.
3 Place the electrode in a bottle 1 cm above the water surface as shown in the graphic above and press CAL.
Cal 1 appears on the display.
The meter endpoints according to the preselected endpoint mode, automatically after the signal has
stabilized or after pressing READ. The standard value is shown on the display.
14 Operating the pH/ORP/Ion/DO meter SG68​ ​
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SevenGo Duo pro™